A variable resolver that may be used against the ADFContext. This
variable resolver may be used when other variable resolvers like the
FacesContext variable resolver and the PageContext variable resolver are
not available.

This variable resolver should not be seen as a replacement for the
JSP/JSF variable resolvers. Those variable resolvers should be used
whenever they are available in the container.

This variable resolver attempts to support many of the implicit objects
that are defined for both the JSP variable resolver and the Faces
resolver. The following standard implicit objects are supported:

Please see the JSP/JSF specifications for more information about
each of these implicit objects.

The HttpADFContextVariableResolverImpl does define an extended implicit
object set for ADF. The following ADF implicit objects are supported:

securityContext -- Resolves to the current SecurityContext.
Equivalent to invoking:
ADFContext.getCurrent().getSecurityContext()

If you wish to use the ADF variable resolver with one of the JSP or
JSF variable resolvers then you may pass the JSP/JSF variable resolver
to the HttpADFContextVariableResovler constructor. This will cause the
JSP/JSF variable resolver to be decorated by the ADF variable resolver.
You may then pass the ADF variable resolver to the JSP/JSF expression
evaluator.